I'm wondering if there's anyone who's had experiences with subungual melanoma who could tell me if I need to push for answers. 
 

Before Christmas I experienced discomfort around my nail on my big toe and this eventually led to some sort of flare up in April which saw the bottom of my nail swell up and blister, with pain so bad that I couldn't walk. I saw a nurse at the time and referred myself to podiatry. I spoke with podiatry on the 4th of May and the person I spoke to suggested I'd need nail surgery and to wait for correspondence arranging an appointment for me to go in to show them my nail in person. I've still not heard anything but have since developed more pigementation on my nail. My nail is split into 3 sections all of which are different shades of brown and over the past few weeks I've developed a dark brown/black area of the nail which is visibly spreading across the nail. I can't find any good information online about what it could be.